package com.tkmybatis.hfy.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.TemplateExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import cn.afterturn.easypoi.word.WordExportUtil;
import lombok.extern.slf4j.Slf4j;

import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.util.Assert;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * @Author: Liu Bo
 * @Descripition: 导出excel和word的通用方法
 * @Date; Create in 2020/12/15 10:00
 **/
@Slf4j
public class ExcelUtils {
	/**
	 * 模板路径
	 */
	private static final String TEMPLATE_PATH = "word/";

	/**
	 * 导出word
	 * <p>第一步生成替换后的word文件，只支持docx</p>
	 * <p>第二步下载生成的文件</p>
	 * <p>第三步删除生成的临时文件</p>
	 * 模版变量中变量格式：{{foo}}
	 *
	 * @param templatePath word模板地址
	 * @param temDir       生成临时文件存放地址
	 * @param fileName     文件名
	 * @param params       替换的参数
	 * @param request      HttpServletRequest
	 * @param response     HttpServletResponse
	 */
	public static void exportWord(String templatePath, String temDir, String fileName,
								  Map<String, Object> params, HttpServletRequest request, HttpServletResponse response) {
		Assert.notNull(templatePath, "模板路径不能为空");
		Assert.notNull(temDir, "临时文件路径不能为空");
		Assert.notNull(fileName, "导出文件名不能为空");
		Assert.isTrue(fileName.endsWith(".docx"), "word导出请使用docx格式");
		if (!temDir.endsWith("/")) {
			temDir = temDir + File.separator;
		}
		File dir = new File(temDir);
		if (!dir.exists()) {
			dir.mkdirs();
		}
		try {
			String userAgent = request.getHeader("user-agent").toLowerCase();
			if (userAgent.contains("msie") || userAgent.contains("like gecko")) {
				fileName = URLEncoder.encode(fileName, "UTF-8");
			} else {
				fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");
			}
			XWPFDocument doc = WordExportUtil.exportWord07(templatePath, params);
			String tmpPath = temDir + fileName;
			FileOutputStream fos = new FileOutputStream(tmpPath);
			doc.write(fos);
			// 设置强制下载不打开
			response.setContentType("application/force-download");
			// 设置文件名
			response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);
			OutputStream out = response.getOutputStream();
			doc.write(out);
			out.close();
		} catch (Exception e) {
			log.error("error:",e);
		} finally {
			//delFileWord(temDir,fileName);//这一步看具体需求，要不要删
		}
	}

	/**
	 * 生成excel对象
	 *
	 * @param params       模板导出参数设置
	 * @param data         模板导出数据
	 * @param templateName 模板名称
	 * @return workBook对象
	 * @throws Exception 异常抛出
	 */
	public static Workbook getWorkbook(TemplateExportParams params, Map<String, Object> data, String templateName) throws Exception {
		String templatePath = TEMPLATE_PATH + templateName;
		File file = getTemplateFile(templatePath);
		params.setTemplateUrl(file.getAbsolutePath());
		Workbook book = ExcelExportUtil.exportExcel(params, data);
		if (file.exists()) {
			file.delete();
		}
		return book;
	}

	/**
	 * 导出excel对象
	 *
	 * @param response httpResponse对象
	 * @param workbook workBook对象
	 * @param fileName 导出文件名
	 * @throws Exception 异常抛出
	 */
	public static void export(HttpServletResponse response, Workbook workbook, String fileName) throws Exception {
		response.setContentType("application/x-msdownload");
		fileName = fileName + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
		response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("gb2312"), "ISO-8859-1") + ".xls");
		ServletOutputStream outStream = null;
		//OutputStream outStream = null;
		try {
			outStream = response.getOutputStream();
			workbook.write(outStream);
		} finally {
			if(outStream != null) {
				outStream.close();
			}
		}
	}

	/**
	 * 获取模板文件--获取到的文件为临时文件，用完后需要手动删除
	 * <p>由于springboot打包成jar之后，不能以绝对路径的形式读取模板文件，故此处将模板文件以临时文件的形式写到磁盘中，用完请手动删除</p>
	 *
	 * @param templatePath 模板路径
	 * @return 模板文件
	 * @throws Exception 异常抛出
	 */
	public static File getTemplateFile(String templatePath) throws Exception {
		File file = File.createTempFile("temp", null);
		ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
		Resource[] resources = resolver.getResources(templatePath);
		if (resources.length == 1) {
			InputStream inputStream = resources[0].getInputStream();
			inputStreamToFile(inputStream, file);
		} else {
			log.info("请检查模板文件是否存在");
		}
		return file;
	}

	/**
	 * InputStream 转file
	 *
	 * @param ins  输入流
	 * @param file 目标文件
	 */
	public static void inputStreamToFile(InputStream ins, File file) {
		try {
			OutputStream os = new FileOutputStream(file);
			int bytesRead = 0;
			byte[] buffer = new byte[8192];
			while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
				os.write(buffer, 0, bytesRead);
			}
			os.close();
			ins.close();
		} catch (Exception e) {
			log.error("error:",e);
		}
	}
	//以下是excel的通用方法类

	/**
	 * excel 导出
	 *
	 * @param list           数据
	 * @param title          标题
	 * @param sheetName      sheet名称
	 * @param pojoClass      pojo类型
	 * @param fileName       文件名称
	 * @param isCreateHeader 是否创建表头
	 * @param response
	 */
	public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) throws IOException {
		ExportParams exportParams = new ExportParams(title, sheetName, ExcelType.XSSF);
		exportParams.setCreateHeadRows(isCreateHeader);
		defaultExport(list, pojoClass, fileName, response, exportParams);
	}

	/**
	 * excel 导出
	 *
	 * @param list      数据
	 * @param title     标题
	 * @param sheetName sheet名称
	 * @param pojoClass pojo类型
	 * @param fileName  文件名称
	 * @param response
	 */
	public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) throws IOException {
		defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName, ExcelType.XSSF));
	}

	/**
	 * excel 导出
	 *
	 * @param list         数据
	 * @param pojoClass    pojo类型
	 * @param fileName     文件名称
	 * @param response
	 * @param exportParams 导出参数
	 */
	public static void exportExcel(List<?> list, Class<?> pojoClass, String fileName, ExportParams exportParams, HttpServletResponse response) throws IOException {
		defaultExport(list, pojoClass, fileName, response, exportParams);
	}

	/**
	 * excel 导出
	 *
	 * @param list     数据
	 * @param fileName 文件名称
	 * @param response
	 */
	public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws IOException {
		defaultExport(list, fileName, response);
	}

	/**
	 * 默认的 excel 导出
	 *
	 * @param list         数据
	 * @param pojoClass    pojo类型
	 * @param fileName     文件名称
	 * @param response
	 * @param exportParams 导出参数
	 */
	private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) throws IOException {
		Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
		downLoadExcel(fileName, response, workbook);
	}

	/**
	 * 默认的 excel 导出
	 *
	 * @param list     数据
	 * @param fileName 文件名称
	 * @param response
	 */
	private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws IOException {
		Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
		downLoadExcel(fileName, response, workbook);
	}

	/**
	 * 下载
	 *
	 * @param fileName 文件名称
	 * @param response
	 * @param workbook excel数据
	 */
	private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws IOException {
		try {
			response.setCharacterEncoding("UTF-8");
			response.setHeader("content-Type", "application/vnd.ms-excel");
			response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + "." + ExcelTypeEnum.XLSX.getValue(), "UTF-8"));
			workbook.write(response.getOutputStream());
		} catch (Exception e) {
			throw new IOException(e.getMessage());
		}
	}

	/**
	 * excel 导入
	 *
	 * @param filePath   excel文件路径
	 * @param titleRows  标题行
	 * @param headerRows 表头行
	 * @param pojoClass  pojo类型
	 * @param <T>
	 * @return
	 */
	public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
		if (StringUtils.isBlank(filePath)) {
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		params.setNeedSave(true);
		params.setSaveUrl("/excel/");
		try {
			return ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
		} catch (NoSuchElementException e) {
			throw new IOException("模板不能为空");
		} catch (Exception e) {
			throw new IOException(e.getMessage());
		}
	}

	/**
	 * excel 导入
	 *
	 * @param file      excel文件
	 * @param pojoClass pojo类型
	 * @param <T>
	 * @return
	 */
	public static <T> List<T> importExcel(MultipartFile file, Class<T> pojoClass) throws IOException {
		return importExcel(file, 1, 1, pojoClass);
	}

	/**
	 * excel 导入
	 *
	 * @param file       excel文件
	 * @param titleRows  标题行
	 * @param headerRows 表头行
	 * @param pojoClass  pojo类型
	 * @param <T>
	 * @return
	 */
	public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
		return importExcel(file, titleRows, headerRows, false, pojoClass);
	}

	/**
	 * excel 导入
	 *
	 * @param file       上传的文件
	 * @param titleRows  标题行
	 * @param headerRows 表头行
	 * @param needVerfiy 是否检验excel内容
	 * @param pojoClass  pojo类型
	 * @param <T>
	 * @return
	 */
	public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, boolean needVerfiy, Class<T> pojoClass) throws IOException {
		if (file == null) {
			return null;
		}
		try {
			return importExcel(file.getInputStream(), titleRows, headerRows, needVerfiy, pojoClass);
		} catch (Exception e) {
			throw new IOException(e.getMessage());
		}
	}

	/**
	 * excel 导入
	 *
	 * @param inputStream 文件输入流
	 * @param titleRows   标题行
	 * @param headerRows  表头行
	 * @param needVerfiy  是否检验excel内容
	 * @param pojoClass   pojo类型
	 * @param <T>
	 * @return
	 */
	public static <T> List<T> importExcel(InputStream inputStream, Integer titleRows, Integer headerRows, boolean needVerfiy, Class<T> pojoClass) throws IOException {
		if (inputStream == null) {
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		params.setSaveUrl("/excel/");
		params.setNeedSave(true);
		params.setNeedVerify(needVerfiy);
		try {
			return ExcelImportUtil.importExcel(inputStream, pojoClass, params);
		} catch (NoSuchElementException e) {
			throw new IOException("excel文件不能为空");
		} catch (Exception e) {
			throw new IOException(e.getMessage());
		}
	}

	/**
	 * Excel 类型枚举
	 */
	enum ExcelTypeEnum {
		XLS("xls"), XLSX("xlsx");
		private String value;

		ExcelTypeEnum(String value) {
			this.value = value;
		}

		public String getValue() {
			return value;
		}

		public void setValue(String value) {
			this.value = value;
		}
	}
}